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dgn D adalah diskriminan dari ax²+bx+c = 0
D = b²-4ac
y₁ = x²-4x+3 dan y₂ = x-1
y₁ = y₂
x²-4x+3 = x-1
x²-4x-x+3+1 = 0
x²-5x+4 = 0
a=1, b=-5, c=4
D = (-5)²-4.1.4 = 25-16 = 9
Luas = D√D/6a² = 9√9/6.1² = 9.3/6 = 4,5 satuan luas